This paper presents an algorithm to detect and classify voltage sag causes based on Wavelet Transform (WT) and Probabilistic Neural Network (PNN). A technique is required which is capable of extracting both time-frequency information to identify the causes which contribute to power quality disturbances. Wavelet transform based on multiresolution analysis is used to extract the features from the...

Ferroresonance is a non-linear phenomenon and very dynamic in the power quality problems. This phenomenon should be carefully analyzed so that preventive measures could be taken before its appearance and prevent injury and damage to electrical power appliances. Ferroresonance is seen more in the middle-voltage networks with supplying unloaded or slightly loaded transformers by cables. The mater...

Power transformers use Kraft paper as insulation in the electrical windings present in the core, which is immersed in oil. In service, the temperature of the windings of core will go to 75C to 85C. If the transformer is over loaded, then the temperature can exceed upto 100°C causing the cellulose chains in the paper to cleave at an accelerated rate, which results in the degradation of mechanica...

This paper deals with the simulation and experimental confirmation of electromagnetic events that could interfere successful formation restoration path during power system procedure. The studied phenomena are more relevant for bulk systems characterized by a low short circuit as backbone. In particular, two case studies have been simulated analyzed: one related to transformer energization path,...

Sustaining a plasma in a magnetron discharge requires energization of the plasma electrons. In this work, Ohmic heating of electrons outside the cathode sheath is demonstrated to be typically of the same order as sheath energization, and a simple physical explanation is given. We propose a generalized Thornton equation that includes both sheath energization and Ohmic heating of electrons. The s...

Abstract Converter transformers are an interface point of HVDC frameworks and basic hardware from activity reliability view point. turned off intentionally under planned support un-deliberately during fault conditions. Random energization transformer delivers high inrush currents due to core saturation asymmetries endanger equipment health. In this paper, charging approach has been proposed. By...

A novel 12 GHz VCO designed and fabricated in a 0.18μm SiGe BiCMOS technology is presented. Strongly magnetic coupled dual LC tanks with fixed and tunable capacitive elements are introduced to extend tuning range and improve phase noise. By hybrid using of varactor tuning, loaded transformer tuning and switched capacitor tuning, the proposed VCO achieves a wide tuning range of 4.3GHz (36%) and ...

This paper focuses on the problem of rural energization in isolated regions of Colombia (Not interconnected zones – NIS). Using the Sustainable Livelihood approach we assess the situation of isolated communities before and after energization. Systems dynamics is used for simulating and evaluating energy policies. We apply our approach to the municipality of Jambaló in the Cauca Department, Colo...